public class EX3_1 {
	public static void main(String args[] ) {
		char a1 = '十',a2 = '点',a3 = '进',a4= '攻';
		char secret = 'A';
		a1 = (char) (a1^secret);
		a2 = (char) (a2^secret);
		a3 = (char) (a3^secret);
		a4 = (char) (a4^secret);
		System.out.println("密文："+a1+a2+a3+a4);
		a1 = (char) (a1^secret);
		a2 = (char) (a2^secret);
                a3 = (char) (a3^secret);
                a4 = (char) (a4^secret);
		System.out.println("原文："+a1+a2+a3+a4);
	}
}	 
